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400ex wont start cold weather

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Old 12-10-2008, 10:11 PM
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Default 400ex wont start cold weather

i have to wait to ride until it warms up then will start all i dose is turn over
 
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Old 12-10-2008, 10:17 PM
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Default 400ex wont start cold weather

have you cleaned the carb?. sounds like a fuel problem,
 
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Old 12-10-2008, 10:23 PM
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Default 400ex wont start cold weather

yeah i do its clean so isent the air filter spark plug
 
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Old 12-10-2008, 10:56 PM
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Default 400ex wont start cold weather

Gotta love those cold blooded Hondas. It's electric start I'm assuming. Open the choke, pump the throttle about 8 times and then hit the button with throttle closed. Also, is it jetted properly? Have you ever changed the jets? What elevation are you at?
 
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Old 12-10-2008, 11:11 PM
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Default 400ex wont start cold weather

jets are good it is jetted but right ocnce it starts will sit there and idle all day 1000 feet around there yes eletric start
 
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Old 12-10-2008, 11:42 PM
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Default 400ex wont start cold weather

<div class="FTQUOTE"><begin quote>Originally posted by: honda400exracer3

jets are good it is jetted but right ocnce it starts will sit there and idle all day 1000 feet around there yes eletric start</end quote></div>

Mine's extremely cold blooded as well. I've heard that going up to a 40 or 42 pilot will help. I haven't tried it yet, but it is on my short list of things to do this winter.
 
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Old 12-11-2008, 09:04 AM
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Default 400ex wont start cold weather

Try the pumping the gas like I said before. That seems to work perfect on my 450.
 
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Old 12-11-2008, 07:43 PM
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Default 400ex wont start cold weather

You should put in a 42 pilot jet. You just pump the throttle 3 or 4 times and it'll fire right up and idle no matter what the outside temp is. That was one of the first things I did to my '08.
 
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Old 12-11-2008, 08:21 PM
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Default 400ex wont start cold weather

Cold air is more dense than warm, so it messes up your fuel:air mixutre, making you lean. Play with the fuel screw and that may do it, or you may have to fattern the pilot jet just a bit.

Also, it has a pumper carb, so if you pump the throtle a few times like has been suggested, that will prime it. I do that, and I never need the choke, not even in the coldest weather.

Make sure you run thinner oil in winter, like at least 10W30, or 5W30 if it is really cold. An ester synthetic like Maxima 530MX if you are willing to pay the tab......

Also see your owner's manual about running a hotter sparkplug in very cold weather.
 
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Old 12-21-2008, 10:37 PM
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Default 400ex wont start cold weather

Put on battery charger for 10 or 15 minutes choke pump start workes on mine after first time no more problems. Batt 1 year old.
 
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